(* baseuri_of_script ?(inc:REG[matita.includes]) fname
* ->
* root, buri, fullpath, rootrelativepath
* sample: baseuri_of_script a.ma -> /home/pippo/devel/, cic:/matita/a,
(* baseuri_of_script ?(inc:REG[matita.includes]) fname
* ->
* root, buri, fullpath, rootrelativepath
* sample: baseuri_of_script a.ma -> /home/pippo/devel/, cic:/matita/a,